I don't think the Rivco risers will fit the R3T. I seem to recall Rivco looking for someone to lend them an R3T awhile back. They were going to use the bike to develop their accessories to fit the new model, and in turn the owner would get the parts for free.
Thanks Harry, thats what I had heard but could not confirm, I did not want to buy the current Rivco risers and find they did not mate with the top clamp.